It would still be nice to have it built into the browser through.
Please explain to me what practical difference it would make to have those 30 lines of JS code in Vivaldi code?
If I have already won this feature by an extension of a former user of this forum, it is much more preferable that the Vivaldi team is dedicated to give us in the next stable the possibility to define domains to go automatically to a Workspace.
Always remember and keep in mind this phrase:
"Usually such features will not be added by Vivaldi dev team if there is a easy way for users to solve a problem with external apps or browser extensions."